Rock-drill.



No. 683,533. Patented Oct. l, 1901.

- w. w. WAITE.

ROCK DRILL.

(Application filed. Jan. 22, 1901.) (No Model.)

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UNITED STATES PATENT FFICE.

' i VVIRT W. YVAITE, OF COLFAX, WASHINGTON.

ROCK-DRILL.

SPEOIFICATION forming part of Letters Patent No. 683,533, dated October 1, 1901.

Application filed January 22, 1901. Serial No. 44,307. (No model.)

To ctZZ whom it may concern:

Be it known that I, WIRT W. WAITE, a citi- "zen of the United States, residing at Colfax,

'in'the county of Whitman and State of Washington, have invented a new and useful Rock- Drili, of which the following is a specification.

This invention relates to drills; and it has for its object to providea machine which may be used for drilling rocks and which will include a series of hammers which by theoperation of a crank will be caused to successively strike the drill-shaft, further objects and advantages of the invention being evi dent from the following description.

In the drawings forming a portion of this specification and in which like numerals of reference indicate similar parts in the several views, Figure 1 is a side elevationof the machine. Fig. 2 is a top plan View of the machine. Fig. 3 is a central longitudinal section of the machine in a vertical plane.

Referring now to the drawings, the present machine comprises a frame including parallel beams 5 and 6, which are mutually connected and upon which is mounted a shaft 7 in suitable bearings, as shown. At one end of the shaft 7, which extends beyond the bars 5 and 6, there is a rotatable carrier in the form of a wheel 8, while at the opposite end is a sprocket 9, with which is engaged a chain from a sprocket 10 on a crank-shaft 11, having an operating-crank 12, whereby the shaft and therewith the wheel or carrier may be rotated.

At the front end of the supporting-frame is an upright 13, having a bearing 14 at its upper end and which alines with a second hearing at the upper end of a forwardly-directed arm 15 on the upright. In these alined bearings is mounted a rotatable and slidable drillshaft 16, having a socket-piece 18 at its forward end to receive a drill-bit, and having a blow-receiving head 19 at its rear end. This head 19 is adapted to be struck by hammers 20 and 21, carried by the wheel 8. Each of the hammers has a handle 22, which is pivoted at its lower end to a spoke of the wheel, and to which handle is connected a triangular frame 23, and at the outer angle of this triangular frame is disposed a roller 24, which, as illustrated, is spaced laterally from the handle at a point between the ends of the handle. The friction-rollers of both frames ongage the slot of a cam. This cam-slot, in fact, is formed by two similar plates and 26, which are attached to the outer face of the beam 5 between it and the wheel 8, one of them within the inclosure of the other and equally spaced. The result is cam-slot 27, a portion of which is concentric with the shaft 7, after which it passes outwardly with a gradual curve, as shown at 28, and finally returns suddenly to the concentric portion, as shown at 29, with an incurve. The crank is rotated so that the wheel is moved to carry the hammers, with their friction-rollers, through the concentric portion of the cam-slot to the portion 28, which will have the effect of moving the hammers to the position shown by the hammer 20 as the rollers pass through said portion 28. The friction-rollers then pass through the incurved portion 29, which acts to lift the hammer-head away from the drillshaft, and subsequently to lower it. This operation of the hammers continues so long as the wheel or carrier 8 is rotated.

To rotate the drill-shaft during the drilling operation, said shaft is provided with a ratchet-wheel 30, with which is engaged a pawl 31, slidably mounted in a guide 32 upon the upright 13, and at the lower end of this pawl is a strap 33, engaged with an eccentric upon a shaft 33, journaled upon the beam 5,. and the rear end of which shaft is provided with a bevel-gear 34, which engages a bevelgear 35 upon shaft 7, so that as shaft 7 rotates shaft 33 isrotated and the ratchet operated to rotate the drill-shaft.

In order to feed the mechanism forward as the drilling operation progresses, the frame of the machine is mounted in a guide 35 at the upper end of a support, said guide having an upwardly-directed portion 36, lying between the beams 5 and 6, and having a.

threaded opening, which alines with openings in the connecting cross-pieces of the beams 5 and 6. A screw-shaft engages this threaded perforation, is rotatably mounted in the cross-pieces, and has an operatingcrank 37 at one end, whereby the shaft may be rotated to feed the frame through the guide.

What is claimed is-- 1. The combination of a revoluble carrier, a hammer pivoted thereto and whirled theregage a drill in the support, cam-engaging elements carried by the hammers above their pivots, spaced plates upon the frame having an intervening cam-slot in which the engag ing elements are received, and means for rotating the carrier to move said elements through the cam-slot to engage the hammers with the drill.

3. A drilling-machine comprising a frame having a drill-support, a drill-shaft mounted in the support for rotatable and reciprocatory movement, a ratchet carried by the shaft, a shaft upon the frame, a rock-lever operably connected with the last-named shaft, a pawl operably connected with the rock-lever and in operative relation to the ratchet, a rotatable carrier upon the second shaft, hammers pivoted upon the carrier, a cam with which the hammers are connected to move them pivotally to strike the shaft in the support, and means for rotating the second shaft to move the hammers into striking position and move them operatively with respect to the cam.

4. A drilling-machine comprising a frame having an upright, a drill-shaft mounted in the upright and having a ratchet, a second shaft rotatably mounted upon the frame, a rock-lever operably connected with the second shaft, a pawl operably connected with the rock-lever and in operative relation to the ratchet, a rotatable carrier on the second shaft, hammers pivoted to the carrier, a friction-roller carried by each hammer above the pivot thereof, spaced plates upon the frame having an intervening cam-slot in which the rollers are received, and means for rotating the second shaft to move the hammers into striking position and to move them pivotally to engage the drill-shaft.

" 5. The combination of a revoluble carrier, a hammer pivoted thereto and whirled thereby, said hammer having a tappet, a fixed cam engaged by said tappet, said cam hav* ing a portion concentric with the axis of the carrier and a portion projecting outwardly from said concentric portion, a revoluble and reciprocating drill support, having a head adapted to be struck by said hammer, and a step-by-step mechanism, actuated by said revoluble carrier to rotate said drill-support, substantially as described. 7

In testimony that I claim the foregoing as my own I have hereto aflixedmysignature in the presence of two witnesses.

R. H. REID, HARRY CORNWELL. 

